| Name | Cosmarium difficile Lütkemüller |
| Authorship | Lütkemüller |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium |
| Contains | Cosmarium difficile var. constrictum Messikommer Cosmarium difficile var. depressum Scott & R.L.Grönblad Cosmarium difficile var. dilatatum Borge Cosmarium difficile f. laeve A.M.Scott & Prescott Cosmarium difficile var. messikommeri (Croasdale) Kouwets Cosmarium difficile var. minutissimae (Woloszynska) Brook Cosmarium difficile f. rectangulum D. B. Williamson Cosmarium difficile var. subimpressulum Messikommer Cosmarium difficile var. sublaeve Lütkemüller Cosmarium difficile var. subreinschii J.Rzicka |
| Remarks | Created from Taxon Name Import: Cosmarium difficile Lütkemüller |
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